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Re:End-to-End Encryption Plugin for Yahoo Mail by moe on Sunday March 15, 2015 @08:05PM (#9208834)
Mutt and Thunderbird come to mind.
Re:End-to-End Encryption Plugin for Yahoo Mail by ekianjo on Sunday March 15, 2015 @09:28PM (#9209178)
Clawsmail as well :)
Re:End-to-End Encryption Plugin for Yahoo Mail by jvehent on Sunday March 15, 2015 @08:40PM (#9208939)
GPG in Mutt is fantastically well integrated.

Now, of course, you have to get used to Mutt first :)

Re:End-to-End Encryption Plugin for Yahoo Mail by middleclick on Sunday March 15, 2015 @10:24PM (#9209401)
Thunderbird with Enigmial also works quite well. I use it everyday.